67 lines
1.6 KiB
Typst
67 lines
1.6 KiB
Typst
#import "/metadata.typ": *
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#import "/tail/bibliography.typ": *
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#import "/tail/glossary.typ": *
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#import "/main/architecture/description.typ": *
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#import "/resources/slides.typ": *
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== Gateway — BLE to MQTT Bridge
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#slide[
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#grid(
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columns: (1fr, 1fr),
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gutter: 2em,
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align: top+left,
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[
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*Architecture*
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- Raspberry Pi 4 — Python
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- Passive @ble:short scan (bleak)
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- MQTTS publisher (paho-mqtt)
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- systemd service — auto-restart
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- Remote access via Tailscale
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],
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[
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// *Data flow*\
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// Thingy:52
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// $->$ BLE advertising
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// Raspberry Pi
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// $->$ MQTTS (TLS)
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// RabbitMQ broker
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// $->$
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// InfluxDB
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]
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)
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]
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== Gateway — Overview
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#slide[
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#align(center)[
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#figure(
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image("/resources/img/gateway_overview.svg", height: 40%),
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caption: [Gateway communication chain — from @ble:short advertising to database storage]
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)
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]
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]
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== Gateway — Key Challenges
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#slide[
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#grid(
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columns: (1fr, 1fr),
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gutter: 2em,
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align: top+left,
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[
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*BLE filtering*
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- GATT $->$ passive advertising
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- Filter: `company_id = 0xffff`
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- exactly 14 bytes
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- Continuous BLE scan (100% duty cycle)
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- Deduplication: 10s cache per MAC address
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],
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[
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*Reliability — validated in production*
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- MQTT auto-restart via systemd
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- `os._exit(1)` on disconnection
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- Validated with 2 cases:
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- Network disconnection
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- Wrong MQTT credentials
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- Multiple nodes publishing
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simultaneously — confirmed by broker
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- No duplicate data
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]
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)
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] |